Door check



Nov'. 15, 1938. F. A. MASSON 2,137,176

DOOR CHECK Filed'May e, 19:58

5g', Z5 [jl Inventar A-r-roRNEY Patented Nov. 1K5, 1938 PATENT voluficl.

, 2,137,1761l Doo-1a CHECK` Y Frederick Albert Masson, Winnipeg,Manitoba,

-. Canada. i.

Application May 6,1938, serial N6. 206,449 4 Claims.v (CLIM-4 9) Doorchecks, at present on the market, are usually ofthe oil type which, inoperation, permit the quick opening of a door under manual pressure andwhen released, to swing back to within a short distance of finalclosing, at-Which timev the door is slowed up to prevent a heavy slam.Such door checklcontrol is due to the movement of oil within the checkcasing', which is moved by a coil spring having a built up tensiontherein.

When such door check are new and properlyl adjusted, they will work wellbutjwhen, in time,

the parts wear and the oil depreciates, preventing its proper function,they are always in the repair shop.

l5 The principal objects of the present invention are toprovidea'mechanically operated door check,

which will do the same work as the oil operated check and at the sametime stand up under years of service. Y 20. A further object of theinvention is to control the door closing speed with a governor which canbe easilyregulated for various speeds,

A further object of the invention is to provide a spring means forreturning the `door which can be quicklytensioned for varying weights ofdoors.

A further object of the invention is to enclose the mechanical parts ina dust proof casing which can be quickly opened for repair purposes.

Still further objects of the invention are to provide means forutilizing the door check for either left or right hinged doors and forfastening the check either on thedoor or the door frame with equalefficiency.

With the above important objects in View which will become more apparentas the description proceeds, the invention consists essentially in thearrangement and construction of parts hereinafter, more particularlydescribed, reference being had to the accompanying drawing in which;

Figure 1 is a perspective View of a door and 'door frame with theinvention in. position.

, Figure 2 is an enlarged horizontal section taken on the line 2-2,Figure l.

Figure 3 is a vertical sectional view taken on the line 3 3, Figure 2.

Figure 4 is a partial horizontal sectional view taken on the line 4-4,Figure 3.

Figure 5 is an enlarged plan view of the crank and lever linkage. Figure6 is a plan view of the ratchet drive unit showing the dog restraininglever.

In the drawing, like characters of reference indicate correspondingparts in the several figures. A framework I encloses a door 2, hinged at3 to the framework. A rectangular shaped boxing 4 'vertedrand fastenedinteriorly and at one corner is secured to the upper part of the door byscrews 5, said screws passing through side extension plates 6 and 'I.VThe upper part of the boxing is closedV by a plate 8, fastened by'screws9 at the corners.` A circular rcup shaped casing. I0 Yis in' tothebottom of the boxing with screws II, said screws passing through anannular ledge I2 on the edgefof said casing. Aribbon spring I3 is woundwithin the casing and has one end fas- ML tened to a spindle I4 whichpasses through the casing, through the bottom and closure plate of theboxing and has the projecting ends squared as at I5; The outer end ofthe spring is fastened to the inner side of the casing.4 5v

4`A gear wheel I6 vis rotatably mounted on the spindle vabove the casingand is spaced therefrom by a washer I'I. A ratchet wheel I8 is fastenedto the'spindle above the gear wheel and is adapted to be engaged'by adog I3 pivoted on the face 20 of the gearrwheel I6 and held inengagement by a flat spring 20. Y

The gear wheel I6 meshes with aV pinion 2| fastened by a set screw 22vto a shaft 23, and said shaft is rotatably `mounted in bearings in thebottom and closure plate of the boxing 4., This shaft is provided with aworm wheel 24 which meshes with and drives a Worm shaft 25 mountedv inslidablebearings 2S and 21 carried in the sides of therboxing and heldin place by set screws 2B and 29. The worm shaftis provided with agovernor 3l) having one endfixed to the worm shaft and the other endslidable thereon and provided with a disk 3l adapted to Contact a`friction leather 32 carried by a bell crank 33' pivotally mounted M on abracket 34 on the interior side of the boxing. This bell crank isnormally held away fromV the disk 3I by a spring 35 which hooks on oneside of the crank, encircles the pivot pin thereof and terminates on theinterior side of the boxing 40.

wall. A set screw 36 passes through the side of the boxing yand contactsWith one of the levers of the bell crank for adjusting purposes.

From the above arrangement, it will be obvious that ifthe spring I3 iswound up and rotates 45 the spindle I4, the governor will be rotated,causing the disk 3l to move into contact with the friction leather 32.By adjusting the set screw 36, the speed of the governor can beregulated and accordingly, theY speed ,oi the spindle. j 50 A crank 3l,having a square hole at one end, is fastened to the upper squared end ofthe spindle I4 by tightening a bolt 38 to close the forked ends of thecrank. The other end of the crank is pivoted at 39- to a lever 4 0 whichpasses back over 55 the boxing and is pivoted to a bracket 4I fastenedby screws to the door framework I.

From the above arrangement, it will be observed that when the door isopened, the crank 3'I will rotate in a clockwise direction and wind upthe spring I3 while the ratchet wheel I8 will click past the dog I9.When the door is released, the spring I3 will cause the door to swingback until the dog engages the ratchet wheel and the speed of thegovernor will then regulate the nal closing speed of the door.

The ratchet wheel I8, shown in Figure 4 of the drawing, is provided withsix teeth. In this connection, it will lbe understood that variousnumbered teeth could be employed to suit therequirements of the trade.Door checks having such a ratchet wheel arrangement would be preferablyused on interior doors where 'a long slow closing movement might bedesirable. On outside doors where cold or heat is to be excluded, itwould be necessary to have the door swing back to within a. few inchesof final closing before the governor started to work. In such cases aratchet wheel having finer teeth, such as shown in Figure 6 would beemployed. Above the ratchety ratchet wheel until an obstruction wasreached.v

The other end of the lever is provided with a downwardly extending pin43 which rides in a cam shaped slot 44 in the dog I9. The end of theslot, adjacent the pivot point of the dog, isv

slightly wider than the pin 43 so that the dog is free to move slightlywhen the pin is 'at that end.

In operation, when the door is opened, the dog will ride freely up andover the ratchet tooth and then move in to the next/tooth. rIfne pin 4,3will then contact the cam slot and move the dog clear of the ratchet forthe balance of the door opening. When the door returns the pin 43 willhold the dog clear in exactly the reverse manner so that the dog willcontact the ratchet wheel for the movement of only one tooth and thefinal movement of the door under governor control will be for only thatamount.

By releasing the crank 3'I at the pivot point 33, it can be swung aroundin either direction to increase or reduce the tension inthe spring I3 toconform to the weight of the door. At such time, the friction lever 42will be stationary at the corresponding end of the cam slot. The crank.'S'VI may be fastened to the bottom` end of the spindle if it isdesired to place theboxing on the door framework or the boxing may bereversed with the closure plate at the bottom if the opposite rotationof the crank is required.

While I have shown the present arrangement of the various parts of theinvention, it will be understood that the design of the mechanism may bealtered to form a more compact construction Without departing from thespirit of the invention.

What I claim as my invention is:

1. A door check comprising a spring actuated spindle rotatably mountedin the frame of said door check, said spindle adapted lto tension saidspring in its rotation, a mechanical governor rotatably mounted in saidframe and operated by said spring through a ratchet and dog, means fordisconnecting said governor from said spring during the tensioning ofsame, means for releasing said dog from said ratchet for apre-determined number of teeth during the de-tensioning of said springand then connecting said dog to said ratchet to drive said governor forthe remaining de-tensioning of said spring.

2. A door check having a spring actuated spindle, a mechanical governordriven from a. ratchet on said spindle through a dog, means carried bysaid spindlek and operable on said dog for releasing said dog from saidratchet in the tensioning of said spring, and means adapted to maintainsaid dog disconnected from said ratchet for a pre-determined number `ofteeth in the de-tensioning of said spring and to connect said dog tosaid ratchet for the final de-tensioning movement of said spring.

3. A door check having a spring actuated spindle and said spring beingtensionable on the rotation of said spindle, a mechanical governordriven by a ratchet on said spindle through a dog, a lever pivoted onsaid spindle and frictionally driven thereby, said lever provided withmeans operable'on said dog to permit said dog to ride the teeth of saidratchet for a pre-determined'spring tension rotation of said spindle andthen to free said dog from the remaining teeth of said ratchet for theremaining spring tensioning rotation of said spindle, and to return saiddog into contact with said ratchet in the reverse manner upon thede-tensioning rotation of said spindle.

4. A door check having a spring actuated spindle, and said spring beingtensionable on the rotation of said spindle, a mechanical governordri-ven by a ratchet on said spindle through a dog, a lever pivoted onsaid spindle and frictionally driventhereby, said lever provided with apin operable in a slot on said dog to permit said dog to ride the teethof said ratchet for a pre-determined spring tension rotation of saidspindle and then to .free said dog from the remaining teeth of saidratchet for the remaining spring tensioning rotationk of said spindle,and to return said dog intov contact with said ratchet in the reversemanner upon the :ie-tensioning rotation of said spindle.

FREDERICK ALBERT" MASSON.

